Definition of criminal conspiracy is defined under section 120A of ipc. Provisions under IPC section 120A explained here:
What is Section 120A IPC:
When two or more persons agree to do, or cause to be done,-
(1) an illegal act, or
(2) an act which is not illegal by illegal means, such an agreement is designated a criminal conspiracy:
Provided that no agreement except an agreement to commit an offence shall amount to a criminal conspiracy unless some act besides the agreement is done by one or more parties to such agreement in pursuance thereof.
Explanation: It is immaterial whether the illegal act is the ultimate object of such agreement, or is merely incidental to that object.
Section 120A IPC Explanation:
When two or more persons enter into an agreement or causes :
(1) an illegal act to be done or
(2) an act which is not illegal but conducted by illegal means
then such an offence will be termed as criminal conspiracy.
Provided that only the agreement to commit the act of criminal conspiracy will amount to criminal conspiracy unless some act beside the agreement is done by one or more parties to such agreement in regard with the conspiracy.